Grade: C

Sanctum takes place in underground caves.  There’s lots of rock climbing, scuba diving, and all kinds of dangerous, claustrophobic situations.  It is a drama that plays out more like a horror movie.  The movie is inspired by a true story, but the characters and what happens to them is fictitious.  It takes a strong stomach to watch this movie – and undoubtedly there is an audience for it, probably the same audience that likes 127 Hours.  The movie is well done technically, but the dialogue is a little cliche.